Propellant extrusion using shaped perforation pins
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United States of America Patent
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Issued Date -
Sep 8, 2005
app pub date -
Mar 3, 2004
filing date -
Mar 3, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An extruded stick-type propellant grain is disclosed that includes a length separated from a strand of extruded propellant material having a predetermined cross-sectional shape provided with a predetermined number of spaced, radially distributed, hollow non-round longitudinal perforations formed in said length of propellant material parallel to and extending along the length thereof and separated and surrounded by a web of the propellant material. The perforations have a geometric cross section selected from the group consisting of non-round shapes that enhance uniformity in unburned web thickness during a normal burn of said length of extruded propellant thereby reducing the amount of unburned slivers. A central perforation is also provided.
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